痣的形成，一般認定與體質、日曬、免疫力低下、賀爾蒙有關。

risk of premenopausal breast cancer, BBD, and family history of breast cancer.

BCC

renal graft

octreotide treatment

Icthyosis

Crohn disease

HIV

melasma

Drugs (azathioprine, TNF blockers, sorafenib, cyclosporine)

Bullous disease healed

After Stevens-Johnson syndrome