Granular parakeratosis is an acquired keratinization disease. We describe the unusual presentation of granular parakeratosis. A 27-year-old healthy female presented with multiple erythematous and brown discoloration plaques on the dorsal aspect of her hands for eight months. Repeated washing, using detergents, and maceration of the skin could develop her lesion.

Background. Dissecting cellulitis of the scalp (DCS) is a recurrent condition in the hair follicle, resulting in permanent alopecia. Objective. We aimed to report the demographic and histopathologic characteristics in patients with dissecting cellulitis. Materials and Methods. We designed a cross-sectional study of patients with DCS who attended the Razi Dermatology Hospital from 2015 to 2019. Results. Seventy-one patients with a female to male ratio of 1 : 10 were recruited. The mean age of the patients was 21.6 years old (range: 13–69). Of them, 77.5% were younger than 32 years. The mean disease duration was 14 months (range: 3–84). Longer disease duration caused more severe disease ( p value < 0.001). However, age and disease severity were not associated ( p value > 0.05). Comorbidity with head and neck acne was found in 29 patients: the age of 28 patients was less than 32 years, which showed acne was associated with younger patients ( p value < 0.001). Concerning the histopathological findings, the most frequent one was lymphoplasma cell infiltration in 90% of the specimens, followed by neutrophilic infiltration in 79%, irregular fibrosis in 66%, granulation tissue in 56%, folliculitis in 49%, deep dermal involvement in 49%, and granuloma in 38% of the cases. Conclusion. DCS was more frequent in men, and it was a disease of youth (second and third decades of life). Head and neck acne has concomitance with the disease, especially in young patients.

Trichothiodystrophy (TTD) is a rare multisystem disorder with an autosomal recessive mode of inheritance. TTD presentations vary from only hair abnormalities like brittle, fragile hair to physical and mental retardation. Mutations of DNA repair genes have been identified as responsible for the disease. A 5-year-old boy presented with sparse, short, and brittle hair to our clinic. He was born to consanguineous parents. Trichoscopy and light microscopy revealed broken hairs with no specific shaft defect. Due to the inaccessibility of the polarized microscopy, a bedside technique was employed. We used a polarized dermatoscope and a mirror in order of achieving transillumination of the hair shafts, which revealed striking bright and dark bands. These bands are referred to as “tiger tail,” which is the pathognomonic sign of TTD. Subsequent polarizing microscopy also confirmed the clinical diagnosis. This highlighted a feasible method for observing the tiger tail, which expanded the known clinical diagnostic tools of TTD.