This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autoimmune skin disorders, Subject name: Dental
Which is not a complication of PUVA therapy 
Select and explain. 
A. Skin cancers, B. Premature aging of skin, C. Cataracts, D. Exfoliation
D: Exfoliation
Answer: D: Exfoliation 
Explanation: Complications of PUVA therapy Sho-term side effects Nausea and vomiting Erythema, pruritus and xerosis Skin pain Pigmentation Central nervous system (CNS) side effects such as headache, dizziness, depression, insomnia and hyperactivity Reactivation of herpes Photo-onycholysis, melanonychia, friction blisters and ankle edema. Long-term side effects Photo aging Eye toxicity: This occurs as psoralens accumulate in the lens with an increased potential for cataract. Cutaneous malignancies: nonmelanoma skin cancer, paicularly squamous cell carcinoma (SCC). Men exposed to PUVA have an increased risk of genital skin cancer.