micropore tape on incision. (photo)

You may not be necessarily sensitive to or allergic to the micropore tape, but the skin may be getting sensitive from the tape coming on and off.  The area looks fairly localized and could be irritated from a stitch that has worked itself close to the skin surface.  As far as scar treatments, I have seen nice results with Biocorneum which is a silicone based scar cream.Definitely check in with your surgeon, though, to check that area.Take care.

Humm let me see now. What would be a good suggestion for you? Awh yes - see your surgeon to check the allergic response and recommend other alternatives.. 

At 4 weeks, you are right around the time that the body starts to break down your suture and sometimes you can get little focal areas of sutures that spit which is what it looks like.  If you were developing a reaction to the tape, I would think it would be the whole length of the incision.  Either way, I would just leave that area open and if you feel a stitch poke out, go to your PS and have them cut it out so the skin can grow together without issue.