Tattoo-related allergic contact dermatitis (ACD) is a delayed-type hypersensitivity reaction to tattoo ink components. The increasing popularity of tattoos has led to a rise in cases of tattoo-related allergic reactions, but diagnosis and management remain challenging. This study aims to report a case of tattoo-induced ACD, explore its clinical characteristics, diagnostic challenges, and management strategies, and highlight the need for improved awareness and safer ink formulations. A case of a 28-year-old Indonesian male with pruritic erythematous papules localized to a multicolored tattoo was examined. Diagnostic approaches included clinical evaluation, dermatologic examination, and patch testing, though the latter was inconclusive. The patient had no history of similar skin conditions, systemic symptoms, or previous allergic reactions to tattoo ink. Dermatologic examination revealed multiple erythematous papules (3–5 mm in diameter) associated with mild scaling, localized exclusively to the tattoo site. Laboratory findings were unremarkable, and patch testing was inconclusive. The patient was managed with topical corticosteroids and antihistamines, leading to symptom improvement. Tattoo-related ACD is an emerging dermatologic concern requiring increased awareness among clinicians. Further research is needed to improve diagnostic techniques and develop safer tattoo inks to minimize allergic reactions.