Hello. Thanks for writing to us at healthcaremagic Judging from the description, this seems to me like a Fungal Infection/ Tinea Cruris; Annular or circular patches with central clearing and peripheral raised margins which may be broken at places or composed of bumps. I suppose it must be itchy too. The location too seems to suggest that it is most likely a fungal infection; fungal infections are common at sites such as waist and pubic region. Fungal infection is not specifically common in pregnancy but weight gain during pregnancy may be a contributory factor. I would suggest that you may use an OTC topical antifungal clotrimazole 1% cream, twice daily for 4-6 weeks, regularly. Oral antifungals may be avoided during pregnancy. An oral antihistamine e.g hydroxyzine is safe in pregnancy and can be taken if itching is bothersome. Regards