Methotrexate Does Not Cause Facial Acne
Methotrexate is not known to cause facial acne as an adverse effect. In fact, methotrexate is used therapeutically to treat severe acne in certain inflammatory conditions like SAPHO syndrome 1.
What the Evidence Shows
FDA Drug Labeling and Guidelines
The FDA drug label for methotrexate extensively details dermatologic adverse reactions, but acne is notably absent from this list 2. The documented skin reactions include:
- Severe reactions: toxic epidermal necrolysis, Stevens-Johnson syndrome, exfoliative dermatitis, skin necrosis, and erythema multiforme
- Aggravation of existing psoriasis lesions with UV exposure
- Radiation recall dermatitis
Neither the British Association of Dermatologists' 2016 guidelines 3 nor the 2024 pediatric consensus guidelines 4 mention acne as a side effect when counseling patients about methotrexate toxicity.
Methotrexate's Therapeutic Role in Acne
Contrary to causing acne, research demonstrates methotrexate has anti-inflammatory properties that can improve severe acne:
- A 2024 bioinformatics study identified methotrexate as having therapeutic potential for acne vulgaris by reducing pro-inflammatory cytokines and inflammatory mediator secretion 5
- An 11-year-old girl with SAPHO syndrome (which includes severe acne as a component) was successfully treated with subcutaneous methotrexate, with improvement in her acne manifestations 1
Documented Cutaneous Reactions
A 2022 systematic review of methotrexate-related cutaneous adverse reactions analyzed 38 patients and found reactions including TEN, papular eruption, vasculitis, and photosensitive dermatitis—but acne was not reported 6.
Clinical Implications
If a patient on methotrexate develops facial acne, consider:
- Alternative causes: hormonal factors, comedogenic skincare products, other medications, or underlying conditions
- Coincidental timing: acne developing independently of methotrexate therapy
- Disease-related: if treating a condition like SAPHO syndrome, acne may be part of the underlying disease rather than drug-induced
The extensive dermatologic monitoring recommended for methotrexate focuses on serious skin reactions (fever, mouth ulceration, unexplained bruising) 3, not acne development.