**7. Conclusion**

308 excimer phototherapy is an existing technology in treating AA. It is safe, effective, and easily administered even in difficult areas. The duration of treatment is shorter than that of whole-body phototherapy. A complete response may take 20–30 sessions, with some responses noted as early as 6–8 sessions.

Calculating the UV dose should be monitored considering the skin type, age, lesion site, and treatment response.

## **Learning points**

