Degenerative collagenous plaques of the hands is an underrecognized acquired dermatosis characterized by slowly progressive linear depressed bands appearing symmetrically at the margins of palmar and dorsal skin of the hands. It is more common in the elderly and is believed to result from chronic pressure and ultraviolet radiation. We present an elderly woman with degenerative collagenous plaques of the hands to highlight an underrecognized rare dermatosis.

Pityriasis rubra pilaris is a papulosquamous inflammatory dermatosis that can be associated with HIV, autoimmunity, infections, certain medications, and neoplasms. Paraneoplastic pityriasis rubra pilaris has previously been reported in association with solid organ malignancies and once with leukemia. Herein, we present an elderly man with paraneoplastic pityriasis rubra pilaris, heralding the diagnosis of low-grade papillary urothelial carcinoma. Our patient's pityriasis rubra pilaris resolved after surgical resection of the tumor.

Subcorneal pustular dermatosis is a rare chronic relapsing bullous neutrophilic dermatosis. Because it can be associated with monoclonal gammopathy of undetermined significance and multiple myeloma, screening for these conditions is necessary. Herein, we present a case of subcorneal pustular dermatosis, with concurrent monoclonal gammopathy of undetermined significance, successfully treated with acitretin.

Cutaneous larva migrans (CLM) is a dermo-epidermal parasitic infection with a disproportionate incidence in developing countries, particularly in, and near tropical areas. It is characterized by erythematous, twisting, and linear plaques that can migrate to adjacent skin. Herein, we present an otherwise healthy 45-year-old woman who acquired a pruritic, erythematous, and serpiginous rash localized to her right medial ankle during a trip to New England. Oral ivermectin, the preferred first-line treatment for cutaneous larva migrans, was administered in combination with triamcinolone. This was followed by removal of the papular area via punch biopsy; treatment was successful with a one-week recovery. Although cutaneous larva migrans has traditionally been considered a tropical disease, clinicians should be cognizant of its expanding geographic spread.

Primary cutaneous CD4+ small/medium T-cell lymphoproliferative disorder (CD4+PCSM-LPD) is a low-grade cutaneous T cell disorder. There is no standardized approach to treatment of CD4+ PCSM-LPD due to its rarity. Herein, we discuss a 33-year-old woman with CD4+PCSM-LPD which resolved after a partial biopsy. We highlight that conservative and local treatment modalities should be considered prior to utilizing more aggressive and invasive treatment options.

Bullous impetigo is a variant of epidermal infection by Staphylococcus aureus, representing 30% of impetigo cases. Its clinical appearance may mimic certain autoimmune blistering dermatoses and other cutaneous infections, sometimes necessitating careful evaluation. Herein we present a patient with bullous impetigo in a striking and characteristic appearance and briefly overview the approach to diagnosis, treatment, and prevention.