To the best of our knowledge, 10 cases (6 men, 4 women; mean age 44.5 years, range 22-59) have been reported since 2012. The main characteristics are summarized in Table 1. Six patients received a combination of BRAF inhibitor (BRAFi) associated with a MEK inhibitor (MEKi), 2 patients a PD-1/PD-L1 inhibitor (PD-1i/ PD-L1i) and 2 patients a CTLA-4 inhibitor (CTLA-4i), including one in combination with a PD-1i. We found that the clinical presentation was different according to culprit drugs. Tattoo eruption associated with BRAFi + MEKi presented mostly as a complete infiltration/induration of dark-colored tattoos with striking inflammatory borders in 5 out of 6 cases [10-13, 16]. Tattoo reactions with CTLA-4i or PD-1i/PD-L1i were reminiscent of what is usually observed with sarcoidosis or granulomatous tattoo reactions in general, e.g. papules and nodules scattered within black tattoos [8, 9, 14, 15]. Tattoos were dark/black in 86% (6/7) of the cases. In case of multicolored tattoos, other colors were spared. Delays of onset after the first cycle were as follows from the earliest to the latest: CTLA-4i + PD-1i (2 months) > BRAFi + MEKi (2-6 months) > PD-1i/PD-L1i (9-15 months). Only 1 patient had additional cutaneous sarcoids on plain skin and erythema nodosum [9]. Biopsies showed noncaseating granulomas in 67% (6/9), including all the cases with CTLA-4i and/or PD-1i/PD-L1i. In the 3 remaining cases, there was only a lymphocytic infiltration without any granulomas [10, 12, 13]. Angiotensin-converting enzyme was elevated in 2 cases of granulomatous reactions [9, 15]. Lung involvement and lymph nodes were reported in 60% (6/10). Management was highly variable according to authors. It included local corticosteroids, combination of local and systemic corticosteroids, abstention with either maintenance or discontinuation of the treatment, and switch to PD-1i or surgery. One patient experienced relapses with BRAFi + MEKi cycles [10]. Overall, outcome was always favorable. Discussion Granulomatous eruptions under ICPIs are an uncommon immune-related adverse event that can become more and more frequently encountered with the increased use of this therapeutic class [7]. All the patients under PD-1i/PD-L1i/CTLA-4i developed sarcoid-like reactions on tattoos. Delays of onset and outcomes were here in line with what is known from the literature [7]. On the other hand, cutaneous granulomatous reactions and sarcoidosis are rather infrequent with BRAFi [17]. Out of the 5 patients under BRAFi + MEKi with available biopsies, 3 displayed a lymphocytic infiltration in the dermis without granulomas. Besides, the clinical presentation was rather different with a marked erythema around the tattoos which is totally unusual compared to the usual tattoo granulomatous reactions we often see in practice [4, 18, 19]. Only 1 patient did not present such an inflammatory reaction around the affected tattoos [16]. To date, there is no case report of tattoo reaction with BRAFi alone. In 1 patient [11], the reaction developed 3 months after MEKi in...