What could my husband have??

Serious question! What does it mean when a man has a swollen head and a little bit down the shaft? 
I gave my husband oral sex about three days ago and now he is swollen. This has never happened before. I did give a hard BJ. He says it is a little tinder. I did have a yeast infection about a month ago but nothing since. 
We just got married in July of this year and prior to that I found he was talking to girls on tinder and a woman from work. He told me he did not do anything sexual with anyone except me. Could he have an STD or an infection by me or by just sucking to hard? Please I'm despite for answers! 

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