The incision is the cut made into one's body's tissues to expose an underlying tissue, organ, or bone to perform the surgical procedure. The incision is generally made with some sharp instrument, like a scalpel, that leaves clean edges on the skin alongside the tissues that heals well.
It's not uncommon to get a rash around surgical incision. It could be due to the adhesive or epoxy used to close the wounds or antibiotic ointments used to prevent infection. In some people, these materials can irritate the skin or cause an allergic reaction.
A surgical incision takes two weeks to heal. Incisions that are more complicated will take longer to heal. Your healing time may vary if you have other medical conditions or are taking certain medications.

Causes of rashes are-
- Overdose of medications or allergies from medicated creams which are directly put on the skin.
- Allergies and rashes can also be from surgical tapes, bandages, and a few rubber products like blood pressure cuffs.

Symptoms of allergies/rashes after surgical incision
- Burning sensation
- Itching
- Redness /discoloration of the skin
- Mild swelling
- Skin blisters
- Skin bumps

How does it happen?
It's a common misconception that the incision only goes through the skin; in reality, it usually goes through one's skin, underlying tissue, fat, and, in some cases, muscle to let the surgeon access to that surgical region. Incisions may expose bone, which can be cut based on the nature of an incision. To examine the rash, the doctors will check your health history and perform a physical exam.

Types of surgical incision -
Clean wounds are those that haven't been infected. They don't appear to be infected or inflamed. Frequently, they affect the eye, skin, or vascular system.
These wounds are classified as non-infected. Although the wound may not show signs of infection, its location puts it at a higher risk of infection. Surgical wounds in the gastrointestinal tract, for example, may be at a high risk of infection.
A surgical wound that has come into contact with an outside object has a high risk of infection and is a contaminated wound. A gunshot wound, for example, could contaminate the skin around the surgical repair site.
This type of wound is referred to as dirty-contaminated. Wounds that have been exposed to fecal matter among them.

To treat an infected wound, you'll need to do the following:
- removing the infection
- removing any dead or damaged tissue from the area surrounding the wound
- antibiotic skin ointments for wounds

Wound healing takes place in stages. At first, your wound may appear red, swollen, and watery. When the wound heals, it may leave a red or pink raised scar. After that, the healing process will last for months or even years. The scar will eventually fade and flatten out. Wound healing can be slowed or hampered by certain medical conditions. Infections or other healing complications may occur in some people.

Well, that is all about rash around surgical incision. Hopefully, this will be of help.