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Sirolimus (SRL) has some dermatologic complications including acneiform eruptions, edema, aphthous ulceration, and onychopathy. However, controlled studies reporting the prevalence and clinical characteristics of mucocutaneous disorders are scarce.To investigate the prevalence and clinical spectrum of mucocutaneous disorders in renal transplant recipients (RTRs) receiving SRL and to compare the findings with those in RTRs not receiving SRL.Fifty RTRs (35 men, 15 women; mean age, 34.6 ± 11.6 yr) receiving SRL, 50 RTRs (36 men, 14 women; mean age, 34.4 ± 11.3 yr) not on SRL were screened for mucocutaneous disorders.In RTRs receiving SRL, skin infection (78%) was the most common dermatologic disorder followed by facial hyperpigmentation (50%) and acneiform eruption (46%). Herpes simplex virus infections (14%) and seborrheic dermatitis (38%) were significantly more common in RTRs on SRL (p < 0.05); the frequencies of edema, aphthous ulceration, acne, and longitudinal nail ridging were similar in both groups (p > 0.05).This study had a small sample size. The investigator was not blinded to immunosuppressive treatment protocols.Renal transplant recipients receiving SRL are more likely to develop seborrheic dermatitis and herpes simplex virus infections than those not taking SRL. Whereas, they are not more prone to edema, aphthous ulceration, acne, or longitudinal nail ridging.