This book covers selected articles on the use of and recent advances of different JAK inhibitors. Different indications, e.g., alopecia areata, psoriasis, atopic dermatitis, vitiligo, granuloma annulare, bullous pemphigoid, chronic actinic dermatitis, lichen planus, and prurigo nodularis, of different JAK inhibitors (tofacitinib, abrocitinib, baricitinib, and ruxolitinib) have been widely reviewed. Each published article on the above drugs in different indications has been reviewed with an abstract of the study and critical comments on the shortcomings and strengths of the study. The book will be of practical importance for dermatologists but will be of great benefit to all undergraduates and postgraduate students, internists, and family practitioners practising not only in India but worldwide too.