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People with mild acne may find over-the-counter (OTC) products that contain benzoyl peroxide or salicylic acid to be effective. These products usually produce any results in 4–8 weeks. Ulcer: A wound deeper than the top layer of skin that damages the second layer of skin. It is concave and variable in size. Deeper ulcers are more serious. Skin lesion removal can typically be done in your healthcare provider’s office, although in some cases it may need to be removed by a surgeon. The lesion and surrounding skin will likely be numbed with a local anesthetic before the removal. Some skin lesions may require further diagnostic tests. These can include blood tests, allergy tests, skin or wound swabs for microbiological investigations, and imaging techniques, such as an X-ray or CT scan. Finally, if the diagnosis is still uncertain or malignancy is suspected, a biopsy can be performed. Hives can itch or sting. Typically, the individual marks last less than 24 hours, though more can continue to appear. Urticaria vs. Angioedema

Plaque: A lesion that is raised like a papule, greater than 1–2 centimeters (0.4 to 0.8 inch) in size. It is solid, rough, and flat-topped.

Urticaria occurs on the outer layer of the skin. Angioedema occurs under the skin. Angioedema can also affect the mucous membranes, such as the eyelids and lips. It can be painful. It often presents as deep swelling around the mouth and eye areas. It can sometimes affect the genitals, hands, or feet.

Valdez, M. A., Isamah, N., & Northway, R. M. (2015). Dermatologic Manifestations of Systemic Diseases. Primary Care: Clinics in Office Practice, 42(4): 607–630. DOI: 10.1016/S0095-4543(15)00107-4 Acne develops when the pores in the skin are clogged with dead skin cells and the skin’s natural oil, called sebum. Bacteria can also get into the clogged pore, inflaming the lesions. Your doctor or nurse will give you specific advice relating to the type of procedure you've had. They may also ask you to: Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. We avoid using tertiary references. We link primary sources — including studies, scientific references, and statistics — within each article and also list them in the resources section at the bottom of our articles. You can learn more about how we ensure our content is accurate and current by reading our editorial policy. Reinehr CPH, Bakos RM. Actinic keratoses: review of clinical, dermoscopic, and therapeutic aspects. An Bras Dermatol. 2019;94(6):637-657. doi:10.1016/j.abd.2019.10.004Moles are circular or oblong patches that are darker than surrounding skin. The three main types of mole are: pyogenic granuloma – small, bright red nodules that often develop after an injury, tend to bleed easily and are often removed Scientists do not yet know exactly what causes psoriasis. However, it is an autoimmune condition — it results from a problem with the immune system. There is no cure, but several treatments are available. Since there are a wide variety of skin lesions that exist, there are many possible causes, including:

However, topical antivirals like these are not always effective. A person may be more likely to see results if they use prescription antiviral medication. Excision biopsy (having a mole removed). Macmillan Cancer Support. www.macmillan.org.uk, reviewed December 2016 https://www.skincancer.org/skin-cancer-information/actinic-keratosis/actinic-keratosis-treatment-options/Schaefer P. Acute and chronic urticaria: evaluation and treatment. Am Fam Physician. 2017;95(11):717-724. Changes in skin sensation (numbness or burning) can happen if nerves on the skin surface are damaged. It's usually only temporary but may last a few months. One way of dividing skin lesions is primary versus secondary. Primary lesions are changes in your skin that aren’t associated with other conditions and include: