Question

A 28-year-old client comes to the office for evaluation of a rash. At first there was only one large patch, but then more lesions erupted suddenly on the back and torso; the lesions itch. Physical examination reveals that the pattern of eruption is like a Christmas tree and that various erythematous papules and macules are on the cleavage lines of the back. Based on this description, what is the most likely diagnosis?

Answer 1

Pityriasis rosea (herald patch) is the most likely diagnosis.

Step-by-step explanation:

Pityriasis rosea is basically a rash which begins as a large oval or cicrular spot on the abdomen , chest or back of the body.

It is also referred as herald patch. This rash initially develops as a single large patch but with time is spread as tiny small patches to the other parts of body including the back , chest and neck and form a christmas tree pattern. It may also occur occasionally in pregnant females.

It is not caused by allergy. Its exact cause is unknown but it may resemble hives or skin reaction. It is also not caused by fungi or bacteria . It is considered as a viral infection according to some of the researchers.