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He needs to see a medical provider, either at home or away. The lump on his back is probably a lipoma, a benign fatty tumor. There are common and nothing needs to be done about them unless they cause discomfort. This one has evidently become large enough to press on nerve endings and cause pain. The lump on his inner thigh may be a boil. There is no way to tell without his seeing a medical provider. If his back is bothering him that much, he should probably come home.
Please let me know if you have additional questions about this.