Sensory receptors in skin?
Your main sensors in the skin are those for some types of pain
or touch. We can distinguish a sharp from a blunt touch, and a
brushing with a wisp of cotton wool will elicit a different
sensation again. Vibration is a separate touch sensation again, as
is also the detection of heat and cold.
Perhaps you could consider smell (olfaction) to be a skin sense,
but here the smell is first dissolved in the mucus before
detection.
[I had a side effect of a drug, which numbed the sense of
vibration - it was only felt as a blunt touch. The operand was a
tuning fork, which produces a small vibration at the stem. The
proper sensations returned after >12 months off the drug.]