Dersol-L Solution, containing Lactic Acid and Salicylic Acid, is generally considered relatively safe when applied topically because absorption into breast milk is unlikely to be significant. However, it is crucial to consult your doctor or healthcare provider before using it during breastfeeding to ensure the benefits outweigh any potential risks to you or your baby. Always avoid applying it to areas that could come into direct contact with the infant, like the nipple area.