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it seems that Betamethasone causes thinning of the skin and atrophy of the groin
"Do not use in skin with decreased circulation; can cause atrophy of groin, face, and axillae; may cause striae distensae, rosacealike eruption; may increase skin fragility; rarely may suppress HPA axis; if infection develops and is not responsive to antibiotic treatment, discontinue until infection is under control; do not use monotherapy to treat widespread plaque psoriasis
Treatment must be monitored by physician with expertise in treating balanitis"