Great question. Here at Stillwater Plastic Surgery, we cautiously recommend our lovely pregnant patients to wait until after pregnancy to receive any type of light therapy treatment. We also recommend that you wait to receive these treatments until after you have stopped nursing. Melasma can be triggered by fluctuations in hormone levels. Therefore hormone levels will not return to normal for several months after pregnancy and nursing. Receiving IPL or BBL while hormone levels are not at normal levels. This can actually cause Post Inflammatory Hyperpigmentation (PIH) and make the pigmentation issues worse.
It's always best to wait until after giving birth to consider cosmetic treatments. You never know how IPL may affect the fetus. After giving birth, your skin may experience many changes. You may notice spots and blemishes that you've never had, and other complexion irregularities. If you have your treatment before, you may find that you'll need another treatment again after.