Keywords: cutaneous tattoo reactions; non-invasive; optical coherence tomography; red dye; tattoo EN cutaneous tattoo reactions non-invasive optical coherence tomography red dye tattoo 469 471 3 05/20/21 20210501 NES 210501 Among the broad spectrum of cutaneous adverse reactions to tattoos, those associated with the use of the red dye have been increasingly characterized. Histopathology from a skin biopsy proved a dermal band-like lymphocytic infiltrate; immunohistochemistry staining was performed revealing prominent T-cell infiltrate, of reactive lymphocytes (Figure 1G-H). Red dye-related tattoo reactions: Could optical coherence tomography be of help?. [Extracted from the article]