Yes, that is correct. A skin test is common, though there are other methods such as blood test. They use a pen to map the patient’s back. Then they scratch the skin with a variety of allergens (e.g. pollens, molds, dander, etc). After assessing which allergens cause a reaction, they can create a batch of allergy treatment specifically for the patient. They keep it refrigerated and use a sample with each visit. The shots can sting for thirty seconds or so, but the relief from allergies typically starts from the very first shot. Most doctors will recommend medication instead, but IMO, there is no comparison with the relief of immunotherapy.
Best,
Christopher