A Study to Evaluate Topical ATR04-484 for EGFRi-Associated Dermal Toxicity

Inclusion Criteria: * Adults ≥18 years of age * Currently treated with an FDA-approved EGFRi, KRASi, or MEKi (or other medications in the pathway, if approved by the Medical Monitor) for the treatment of cancer with or without concurrent chemotherapy, or for neurofibromatosis, and expected to continue treatment with the medication through the study treatment period * Has Grade 2 or 3 non-infected moderate to severe dermal toxicity affecting the face (the neck, chest, back and other areas may also be affected); Grade 1 toxicity may be permitted in up to 25% of enrolled patients Exclusion Criteria: * Significant skin disease other than EGFRi-related dermal toxicity * Treatment with topical mid- to high-potency topical corticosteroids, or topical antibiotics or antibacterial washes on the face, neck, chest, or back within 7 days prior to baseline; treatment with systemic antibiotics or systemic corticosteroids within 7 days prior to baseline * Residing with an immunocompromised person residing with them in the same dwelling from the baseline visit through 2 weeks after the treatment period