There are three types of scrotitis:
1, The erythematous type is symmetrically distributed on both sides of the scrotum, about 3×4cm in size, with sharp-edged erythema, covered with thin gray or brownish scab, with a rough surface. After peeling off the scab, slightly red skin is exposed, without significant infiltration. When the lesion expands, it can fuse at the base of the penis.
2, The papular type initially appears on one side of the scrotum with several scattered soybean-sized papules, significantly elevated above the skin, flat-shaped, covered with thin brownish scab, which later increase in number and size, densely and symmetrically distributed on both sides of the scrotum seam, about 3×4cm, merging into patches, often fusing at the base of the scrotum when numerous.
3, White papule psoriasis type This type is rare but very typical, a large area in front of the scrotum is fused into flat papules the size of melon seeds, with a silvery color, and silver scales fall off when scratched.