Whatever the cause, once hair fragments become 'stuck' in the skin they irritate it and cause inflammation. Because of local pressure, hair growing in the natal cleft may become pushed into the skin pits. Skin dimplesĪnother theory is that skin dimples (skin pits) may develop in the skin between the buttocks as a result of local pressure or friction causing damage to the small structures below the skin, responsible for making hairs (the hair follicles). Part of the abnormality in this part of the skin may be that the hairs grow into the skin rather than outwards. This may explain why the condition tends to run in some families.
One theory is that the problem may develop from a minor abnormality in the skin between the buttocks that was present at birth.
