Oral erythromycin in pityriasis lichenoides chronica and pityriasis lichenoides et varioliformis acuta.

Pityriasis lichenoides (PL) is an uncommon cutaneous disorder. Oral erythromycin is proposed to be effective in treating the disease. Here, we reported 16 pediatric patients with PL and systematically reviewed published literatures on erythromycin treatment response in pediatric PL patients, to observe the different treatment response to erythromycin in the pityriasis lichenoides chronica (PLC) and the pityriasis lichenoides et varioliformis acuta (PLEVA) groups. Sixteen patients, 8 with PLC and 8 with PLEVA, were treated with erythromycin. In the PLC group, 25% (n = 2) patients responded to erythromycin, while in the PLEVA group, 87.5% (n = 7) patients responded to erythromycin. The response rate was higher in the PLEVA group than the PLC group (P =.05). No side effect was reported in the 16 patients. A total of 34 children including 16 from our studies were included for further descriptive analysis, in which 12 had PLC and 22 had PLEVA. In the PLC group, 41.7% (n = 5) of patients responded to erythromycin while in the PLEVA group, 90.9 % (n = 20) of patients responded. The response rate was higher in the PLEVA group than the PLC group (P = .004). In conclusion, erythromycin is effective and safe in the treatment of children with PL, and erythromycin was more effective in patients with PLEVA than PLC.