my boyfriend has noticed he has small raised skin/skin tag like/pimple like lumps on the entrance of his anus, some are on their own, some are clustered, it doesn t look like you could squeeze them, or that s there s any liquified substances inside them but they have just suddenly appeared. he s been under a lot of stress lately, do you think that is what has caused these lumps to appear? he s never been in contact with warts and never had anal penetration other than clean sex toys.