FGF2 and alopecia areata: FGF-2 successfully stimulates hair growth by promoting dermal papilla cell proliferation and increasing the size of hair follicles; moreover, when it is encapsulated in liposomes and hydrogels from silk fibroin, it can quickly regenerate hair and restore hair follicles to the anagen phase, thus providing a promising strategy for preventing hair loss in patients with alopecia areata [39].