Exam 21: Skin

A 35 year old woman had silver patches surrounded by erythema (redness)on her elbows and knees.A biopsy was done,and a representative section is shown in the accompanying photomicrograph.Which one of the following is the best diagnosis?

A 4 year old boy developed raised bumps on his fingers.His friends at his pre-school had similar lesions.A biopsy of one of the lesions is shown in the accompanying photomicrograph.Which one of the following is the best diagnosis?

A 75 year old man had several brown,raised lesions on his arms.One of them began to bleed,after he snagged it while putting on his shirt.Fearing melanoma,he consulted his GP,who removed it.A representative section is shown in the accompanying photomicrograph.Which one of the following is the best diagnosis?

A 4 year old boy developed raised bumps on his fingers.His friends at his pre-school had similar lesions.A biopsy of one of the lesions is shown in the accompanying photomicrograph.Which one of the following is the best diagnosis?

The thickening of the epidermis in this photomicrograph is due primarily to enlargement of which one of the following epidermal layers?

How would you classify the pigmented lesion shown in the accompanying photomicrograph?

A 39 year old female consulted her GP because of a small,non-healing ulcer that appeared on her nose.Upon examination,she was overly tanned,and had a 0.8 cm diameter lesion with pearly white raised edges on the right side of her nose.The lesion was completely excised.A representative section is shown in the accompanying photomicrograph.Which one of the following is the best diagnosis?

A 45 year old woman noticed a whitish patch on the skin of her forearm.Her GP biopsied the lesion,which a pathologist eventually diagnosed as lichen planus.A representative section is shown in the accompanying photomicrograph.How would you characterise the structure marked "CB" in the high power photo on the right?