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Hydroxychloroquine (HCQ) is the first‐line systemic treatment for cutaneous lupus erythematosus (CLE). Whole blood HCQ concentration (WBHCQ) was found to correlate with CLE severity among Caucasians. However, studies on Asians are scarce. We aim to explore the relationship of WBHCQ with CLE disease activity among multi‐racial Malaysians and the factors associated with WBHCQ. A cross‐sectional study...