Facial cupping is an extremely effective and stimulating treatment. For that reason, we recommend not using them if you are experiencing any of the following conditions where you would use the cups: inflamed, irritated or damaged skin, broken capillaries, moles, skin tags, warts, severe acne, eczema, psoriasis, sores, undiagnosed lumps, melanoma, cancer or current use of blood thinners. Avoid high heat and sun exposure 12 hours after treatment. Do not leave cups suctioned on the skin without moving them as they will leave bruising.