Sayyiduna Ibn Umar (may Allah be pleased with them both) narrated that whenever he had cupping done, he would wash the places of the cupping.
(b) It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both): "Wash the traces of the cupping off your body, and that is sufficient for you."
This is also narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) from the Prophet (peace and blessings be upon him), but its chain contains weakness.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 665