This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Viral infections, Subject name: Dental
A 42-year-old woman presents with brown papules located around her eyes and on the malar cheeks. Several of her aunts were similarly affected at the same age. She would like them removed. Which of the following treatments is most likely to cause hypopigmentation? 
Select and explain. 
A. Liquid nitrogen, B. Low voltage hyfrecation, C. Keratolytic moisturizer, D. Snip excision
C: Keratolytic moisturizer
Answer: C: Keratolytic moisturizer 
Explanation: Lesions appear to be was. Electrosurgical diathermy (cold cautery; hyfrecation) TOC for was. No hypopigmentation known. Keratolytics : Most commonly used keratolytics are salicylic acid and benzoyl peroxide. These can cause hypopigmentation. T/t of was with liquid nitrogen may be painful. There is a potential for scarring the matrix with aggressive freezing. Pain and erythema may be reduced by a single application of very potent steroid.