DISEASE CHARACTERISTICS: Clinically dysplastic nevi with a personal history of cutaneous melanoma and/or a family history of cutaneous melanoma in two or more blood relatives (blood relatives include first, second, or third degree relatives from the same blood line) Clinically dysplastic nevi defined as: At least 4 mm in diameter and flatness (either a component or throughout) with at least 1 of the following: Variable pigmentation Irregular or asymmetrical outline Indistinct border Must have at least 10 or more large (diameter at least 4 mm) clinically dysplastic nevi on the trunk or extremities (excluding head, pubic area, breasts in women, hands, and/or below the knees) No stage III or IV melanoma Patients with history of melanoma who received adjuvant therapy must be more than 1 year from completion of therapy

PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: Not specified Hematopoietic: WBC greater than 3,500/mm3 Platelet count greater than 100,000/mm3 Hepatic: Bilirubin less than 2.0 mg/dL AST less than 2 times normal Alkaline phosphatase less than 2 times normal Renal: Creatinine less than 2.0 mg/dL Cardiovascular: No symptomatic arteriosclerotic coronary artery disease No history of coronary artery disease Other: Fasting triglyceride level less than 210 mg/dL Fasting cholesterol level less than 350 mg/dL No nonmalignant disease that would preclude administration of retinoids No psychiatric conditions that would preclude study compliance Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception during and for 6 months after study

PRIOR CONCURRENT THERAPY: See Disease Characteristics Biologic therapy: Not specified Chemotherapy: Not specified Endocrine therapy: Not specified Radiotherapy: Not specified Surgery: No prior coronary bypass surgery Other: No prior systemic retinoids No concurrent vitamin (except a daily multivitamin) or dietary supplement No concurrent systemic therapy for hyperlipidemia