Natural ways to prevent dark underarms include rubbing underarms with lemon wedges, sliced potatoes or baking soda, according to Bustle. Applying moisturizer after rinsing off maintains the elasticity of the skin and protects the underarms, especially when going out.
Baking soda removes dead skin cells from underarms, and potato juice brightens dull skin and promotes an even skin tone, claims Bustle. Raw honey, which is an antibacterial, helps to fade dark spots keep skin smooth. Applying moisturizer after rinsing off lemon juice or honey protects underarms from ultraviolet radiation. Other natural solutions that prevent and cure dark underarms include mixtures of cucumber and lemon juice, gram flour and yogurt, and milk and honey, states FindHomeRemedy.com.