I've had a variety of tactile hallucinations at times when I've been worse.

The fisrt I ever had was feeling as though I had a drop of water on me for a second, but then when I checked there was no wetness. Happened a few times.

I've had a creeping sensation along my scalp at night... hard to describe, not quite like bugs, not quite static but in between. Probably the most persistent one for me... went on for a couple of weeks.

Also felt like I walked into a spiders web once but I was in the middle of the room & there can't have been anything there since I walked past it like 10 seconds earlier.

The most disturbing though, similarly to you probably, was the feeling of someone putting their hand or whatever on my shoulder from behind but no-one being there. That was a one off for me though.

I think it can be hard to know what is just a strange sensation & what is a tactile hallucination. Sometimes meds can cause strange sensations but it's unusual.

Your p-doc is the only one that can really guess what's going on. Generally unless these are distressing to you, they aren't the most serious of symptoms though... just a bit strange. Having said that, even small things can sometimes be indicative of a return of symptoms, so I always think it's worth bring up anything out of the ordinary.