Clinical Presentation-Skin Disorders

Tinea capitis, or “ringworm” of the scalp, presents as one or more sharply marginated plaques of partial alopecia. Inflammation and scale are present, but often these two changes are quite minimal. The recognition of broken hairs (stubble and black dots at the follicular orifices) is the best clue to correct diagnosis. Nearly all cases occur in children, but the diagnosis should be considered in any adult presenting with evidence of localized alopecia . Kerion formation is a complication that occurs in about 10% of cases. This represents a sensitization phenomenon whereby the fungi induce a remarkably brisk inflammatory reaction with resulting pustulation, crusting, and edema formation. Wood’s lamp examination does not reveal fluorescence in the most common forms of tinea capitis or in kerion formation. Unfortunately, KOH preparations are difficult for the inexperienced to interpret. For this reason, any suspected diagnosis requires the plucking of infected hairs for fungal culture. Course and PrognosisTinea capitis and zoophilic tinea corporis usually resolve spontaneously after 6 to 12 months of activity. Tinea pedis, tinea cruris, and anthropophilic tinea corporis continue indefinitely. There are, however, periods of relative quiescence and exacerbation. All of these fungal diseases respond well to treatment, but with the exception of tinea capitis and zoophilic tinea corporis infections, recurrence following treatment is rather likely. PathogenesisTinea pedis, tinea cruris, and anthropophilic tinea corporis are most commonly caused by Trichophyton rulnum. Trichophyton interdigitate and Epidermophhyton floccoswn infections are also seen. Generally, one cannot predict the causative organism on the basis of clinical appearance. Zoophilic tinea corporis can be caused by Microsporum canis, Trichophyton mentagrophytes, and Trichophyton verrucosum. Tinea capitis is caused by Trichophyton tonsurans in 90% of cases. The likelihood of inoculation with any of these fungi is enhanced if cuts and scratches are present on the skin. Clinical evidence of infection following inoculation is enhanced by the presence of warmth and moisture, such as occurs in the groin and under footwear. Depression of cell-mediated immune responsiveness, as in atopic patients, is a major predisposing factor for the development of T. rubrum infection. TherapyTinea cruris and those cases of tinea pedis that involve only the web spaces can be treated with any of the topical antifungal agents. Other forms of tinea pedis usually require the use of griseofulvin. Mild cases of tinea corporis also respond well to topical agents. Extensive disease and those cases with a component of follicular involvement are best treated with griseofulvin. Tinea capitis requires the use of griseofulvin. Orally administered ketoconazole therapy is rarely appropriate for either tinea corporis or capitis. Kerion on nation, if present, can be treated with intralesional steroid injections or with a short burst of systemically administered steroids.

Complete Information on Dentinogenesis imperfecta with Treatment and Prevention

Dentinogenesis imperfecta is a disorder of tooth growth. This circumstance is inherited in an autosomal predominant form, which means one transcript of the altered gene in each cubicle is adequate to induce the disorder. There are three types of dentinogenesis imperfecta. Type I is associated with osteogenesis imperfecta. Type II was previously found to be linked to altered glycosaminoglycan concentrations. Type III is the brandywine form, named for the city brandywine, maryland, where there was a large population of patients with this disorder. Type III tends to be less severe than type II. The severity of discoloration and enamel fracturing in all dentinogenesis imperfecta types is highly variable even within the same family. Genetic mutations, or alterations in an individual’s genome, can be inherited, affecting cells that perpetually divide (germ-line mutations), or they can occur at any point during a person’s life.In most cases, a stricken individual has one parent with the circumstance. This circumstance causes the teeth to be discolored (almost frequently a blue-gray or yellow-brown tone) and translucent. It is usually an autosomal dominant trait with variable expressivity but can be recessive if the associated osteogenesis imperfecta is of recessive type. Clinical appearance is variable. However, the teeth usually involved and more severely affected are deciduous teeth in type 1, whereas in type 2 both the dentitions are equally affected. Due to the lack of support of the poorly mineralized underlying dentin, the enamel frequently fractures from the teeth leading to rapid wear and attrition of the teeth. Teeth are also weaker than normal, making them prone to rapid wear, breakage, and loss. These problems can affect both primary teeth and permanent teeth.Early and accurate diagnosis of dentinogenesis imperfecta is urgent to enable proper preventative interventions and optimum dental handling. If left raw it is not rare to view the whole DI affected dentition ratty away to the gingiva. Providing optimal oral health treatment for dentinogenesis imperfecta frequently includes preventing severe attrition associated with enamel loss and rapid wear of the poorly mineralized dentin, rehabilitating dentitions that have undergone severe wear, optimizing esthetics,and preventing the common dental problems associated with caries and periodontal disease. Although pulpal pathosis is rarely reported with dentinogenesis imperfecta, endodontic treatment is occasionally necessary and has a guarded prognosis if initiated after pulp canal obliteration has occurred. Management of permanent dentinogenesis imperfecta teeth with fracturing and excessive wear can be treated with porcelain fused to metal crowns.

Allergic contact dermatitis, like atopic dermatitis, almost always begins on the dorsal surface of the fingers and hands. This predilection is most likely due to the protective effect of the thick keratin found on the palmar aspect of the fingers and hands. Allergic contact dermatitis differs from atopic dermatitis in that excoriations are less prominent and a visible eruption precedes the scratching. Before a diagnosis of allergic contact dermatitis can be proven, however, several things must occur: a suspected contactant must be identified; a positive result to patch testing must be obtained; and the patient must demonstrate improvement when the contaclant is removed. The most readily identifiable type of allergic contact dermatitis is that of nickel allergy because the emplion occurs in such close proximity to the offending ring, bracelet, or watchband. Many industrial chemicals cause allergic contact dermatitis of the hands. The agents most commonly involved are chromates and epoxy resins. Cosmetics (cinnamates, lanolin, Peruvian balsam) are occasional offenders. Soaps and detergents cause irritant, rather than allergic, contact dermatitis.

Irritant contact dermatitis is characterized by the presence of chapping, cracking, and fissuring. Inflammation, weeping, crusting, and excoriations are considerably less prominent. The changes of irritant contact dermatitis occur most commonly on the volar aspects of the fingers, but the palms and dorsal surface of the hands, particularly over the knuckles, may also be involved. The skin is dull red and often has a shiny or glistening surface. Tingling or burning pain is present; pruritus is not prominent. The diagnosis is based on the clinical appearance and on the history of frequent exposure to soap, water, or other solvents. Irritant contact dermatitis is an occupational hazard for mothers, housewives, waitresses, bartenders, and those in the health professions. A second type of irritant contact dermatitis occurs because of moisture retention and maceration under wide rings. Thus, eczematous changes around rings may be either allergic or irritant in etiology. Patch testing to metals may be necessary to differentiate between these two possibilities.

Scabies is an infrequent cause of hand eczema. It is characterized by initial development of solitary vesicles or inflammatory vesicopapules in the web spaces. From there, eczematous changes can spread onto the dorsal surface of the hands and fingers. The diagnosis is based on this distribution pattern, evidence of contagion, recovery of the mite, and the presence of typical lesions at other body sites.

Autoeczematization (or autosensitization) is a reaction pattern in which eczematous disease elsewhere on the skin induces “metastatic” eczematous lesions at some distant site. The hands, particularly the palms and fingers, are frequently involved in this reaction. A vesicular component that resembles dyshidrosis is often present. A diagnosis of autoeczematization is likely: (1 ) if vesiculation is explosive in onset, (2) if there is minimal grouping of the vesicles, and most importantly, (3) when marked eczematous disease is found on the feet or elsewhere on the body.

The diagnosis and therapy for hand eczema are complicated because more than a single process is frequently involved. Thus, dyshidrotic eczema, allergic contact dermatitis,

and scabies are often complicated by the concomitant presence of either the itch-scratch cycle (atopic dermatitis) or irritant contact dermatitis resulting from soap and water exposure. With so many processes occurring at once, it is easy to see why many clinicians give up trying to sort out the individual processes responsible for the problem and simply label it “hand eczema.” Nevertheless, since the treatment varies with each of the processes, it is important to identify them individually. As mentioned above, where this cannot be done on the basis of history and examination, it may be necessary to use a short course of systemic steroids so that the initial characteristic changes can be identified as they recur.

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Tinea capitis, or “ringworm” of the scalp, presents as one or more sharply marginated plaques of partial alopecia. Inflammation and scale are present, but often these two changes are quite minimal. The recognition of broken hairs (stubble and black dots at the follicular orifices) is the best clue to correct diagnosis. Nearly all cases occur in children, but the diagnosis should be considered in any adult presenting with evidence of localized alopecia . Kerion formation is a complication that occurs in about 10% of cases. This represents a sensitization phenomenon whereby the fungi induce a remarkably brisk inflammatory reaction with resulting pustulation, crusting, and edema formation. Wood’s lamp examination does not reveal fluorescence in the most common forms of tinea capitis or in kerion formation. Unfortunately, KOH preparations are difficult for the inexperienced to interpret. For this reason, any suspected diagnosis requires the plucking of infected hairs for fungal culture.
Course and Prognosis

Tinea capitis and zoophilic tinea corporis usually resolve spontaneously after 6 to 12 months of activity. Tinea pedis, tinea cruris, and anthropophilic tinea corporis continue indefinitely. There are, however, periods of relative quiescence and exacerbation. All of these fungal diseases respond well to treatment, but with the exception of tinea capitis and zoophilic tinea corporis infections, recurrence following treatment is rather likely.
Pathogenesis

Tinea pedis, tinea cruris, and anthropophilic tinea corporis are most commonly caused by Trichophyton rulnum. Trichophyton interdigitate and Epidermophhyton floccoswn infections are also seen. Generally, one cannot predict the causative organism on the basis of clinical appearance. Zoophilic tinea corporis can be caused by Microsporum canis, Trichophyton mentagrophytes, and Trichophyton verrucosum. Tinea capitis is caused by Trichophyton tonsurans in 90% of cases.

The likelihood of inoculation with any of these fungi is enhanced if cuts and scratches are present on the skin. Clinical evidence of infection following inoculation is enhanced by the presence of warmth and moisture, such as occurs in the groin and under footwear. Depression of cell-mediated immune responsiveness, as in atopic patients, is a major predisposing factor for the development of T. rubrum infection.
Therapy

Tinea cruris and those cases of tinea pedis that involve only the web spaces can be treated with any of the topical antifungal agents. Other forms of tinea pedis usually require the use of griseofulvin. Mild cases of tinea corporis also respond well to topical agents. Extensive disease and those cases with a component of follicular involvement are best treated with griseofulvin. Tinea capitis requires the use of griseofulvin. Orally administered ketoconazole therapy is rarely appropriate for either tinea corporis or capitis. Kerion on nation, if present, can be treated with intralesional steroid injections or with a short burst of systemically administered steroids.

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