<s>[INST] What can cause an inclusion cyst in a 5 yr olds scrotum?  How likely is it that sexual abuse or assault was involved to cause this?  To explain a little this child had an inclusion cyst removed and has made accusations of other things happening (sexual in nature) [/INST] Hi! Epidermal inclusion cysts or commonly known as sebaceous cysts are caused due to minor or major trauma to the skin epidermis, shaving, cuts, bites, nibbling any kind of injury! In the events involved, portion of skin epidermis get deep into the dermis or suburbs along with its mother cells/stem cells in the basal layer where it proliferates like a normal skin tissue but no way out for the keratin which therefore is collected within a cavity / cyst! Hope you could understand that kind of sexual abuse too can lead to the cysts!regards, Therefore </s>