Lesions of pityriasis rosea are distributed mostly on the:
**Core Concept**
Pityriasis rosea is a skin condition characterized by an initial "herald patch" followed by a secondary eruption of oval-shaped, scaly lesions. The distribution of these lesions is often symmetrical and follows the lines of skin cleavage, reflecting the underlying anatomy of the skin.
**Why the Correct Answer is Right**
The lesions of pityriasis rosea are predominantly distributed on the trunk and proximal limbs, following the lines of skin cleavage. This distribution is thought to be due to the fact that the lesions are more likely to appear on areas of the skin where the epidermis is thicker, such as the trunk and proximal limbs. The lines of skin cleavage, also known as Langer's lines, are the natural paths of skin tension and are more prone to skin eruptions.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the face is not a common site for pityriasis rosea lesions.
**Option B:** This option is incorrect because the lesions of pityriasis rosea are not typically distributed on the palms and soles, which are areas of the skin with a high concentration of sweat glands and sebaceous glands.
**Option C:** This option is incorrect because the distal limbs, such as the hands and feet, are not typically affected by pityriasis rosea.
**Clinical Pearl / High-Yield Fact**
Pityriasis rosea is often associated with an initial "herald patch," which is a single, large lesion that appears before the secondary eruption of lesions. This herald patch is often located on the trunk or proximal limbs and can be a useful diagnostic clue for this condition.
**Correct Answer: C. Trunk and proximal limbs.**