Hair replacement systems from companies like 101 Hair Replacement Systems offer a nonsurgical alternative for remedying hair loss. While these are not the same as toupees, they do involve a layer of hair attached to a base that is then attached to your head. Newer hair replacement technologies are much more comfortable than toupees and older systems. However, because the replacement hair is a separate layer, it still has the potential to make your skin itch if it isn't attached properly, and if you are not using the right system for you. If you've encountered itchy issues, you don't have to give up the system; just look at how it's attached.
Friction From Being Too Loose
Some hair replacement bases are woven into existing hair. If the weave is too loose and the base or the hair under it keeps moving around, that can create friction that leads to minor irritation. That irritation can start to itch and get worse as continued movement creates more irritation. Think of that itch on your arm that only got worse when you tried to scratch it through your shirt sleeve — that extra layer of cloth, plus the light movement of the cloth over your skin, made the itch grow more noticeable. The base of the hair replacement is the same way, with the base and the hair caught under the base acting like the cloth. Redoing the weave so that it's more secure and so that hair underneath doesn't get a chance to move around so much can help stop itching and irritation.
Irritation From Bonding Material
If you went with a bonded base instead, the material used to bond the base to your scalp could be causing a little irritation of its own. Some people develop rashes when adhesives are used on their skin; if you've ever had red welts appear after removing a bandage, you are likely one of these people. Moving to a woven system or trying a different bonding material could work.
Sweat From Lack of Ventilation
The base of the replacement system should allow for some ventilation. That does not mean having it elevated to let air underneath the layer, but rather having a breathable base. Otherwise, sweat from your scalp could make your skin irritated if the sweat can't dry up.
Hair replacement systems come in a number of configurations, so if one doesn't seem to work for you, you'll have several other options. These systems are continually being improved, too, so if you have comments about how some of them made your skin feel, let the company know.