1. Mo fa'alavelave fa'alavelave, ichthyosis ma psoriasis fa'aletonu
2. Vailaau fa'ama'i-keratosis.
3. E lauiloa foi o le retinoic acid ma le retinoic acid, o lenei galu o le metabolic intermediate product o vitamini A i totonu o le tino, lea e masani ona aafia ai le tuputupu aʻe o le ponaivi ma le metabolism o sela epithelial, ma ei ai aʻafiaga o le faʻalauteleina o le epithelial cell proliferation ma keratolysis. .
