I have not seen this yet, but am not surprised, COVID causes systemic inflammation and that can include skin, GI, Kidney, Liver, Heart, M/S, brain and i would guess hair follicles. I would try systemic anti-inflammatories - Turmeric, Gotu Kola (also supposed to promote hair growth), Amla, etc and H & A’s Osteoherb, as well as topical use of Calendula, Gotu Kola and Nettles.