According to Clearly Derm, there are two main types of acne: comedonal and inflammatory, and it's the latter that usually comes with the symptom of itching. The dermatology site notes that those spots tend to be cystic, which tend to be quite painful as well.
Positively, though, itchy acne can also be a sign of healing, according to Healthline. When your acne is beginning to heal, your skin starts to shed to "uncover new layers of skin" which Healthline says is part of the healing process.
But per the American Academy of Dermatology (via Medical News Today), itchiness can be a symptom of other skin conditions. The AAD notes that some types of folliculitis (an inflammation of the hair follicles) can result in acne-like symptoms. This is down to bacteria infecting the follicles, which can cause tiny bumps that may itch and look very similar to pimples. Certain types of fungus can also cause this type of inflammation in the hair follicles, including a type of yeast called pityrosporum folliculitis that "may produce an itchy, acne-like rash," according to the AAD.
And in some cases, itching can actually be caused by an allergy to active ingredients, preservatives, or thickening agents in an acne treatment product. An allergy to one of these ingredients can cause "mild itching, swelling, or burning" according to Medical News Today. Other ingredients often used in these products like salicylic acid, benzoyl peroxide, and retinas can dry the skin and cause itching as well.
