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  2. Rough skin patches on the back could be due to the following conditions123:
    1. Actinic keratosis: Caused by sun exposure, it appears as rough, scaly patches.
    2. Seborrheic keratosis: Gradually growing bumps, common after age 50.
    3. Keratosis pilaris: Painless bumps around hair follicles.
    了解详细信息：

    Actinic keratosis

      Actinic keratosis - Symptoms & causes - …

      www.mayoclinic.org/diseases-conditions/actinic-ker…

      Seborrheic keratosis

      • Symptoms A seborrheic keratosis grows gradually.

      Seborrheic keratosis - Symptoms & caus…

      www.mayoclinic.org/diseases-conditions/seborrhei…

      Keratosis Pilaris

      • Overview Keratosis pilaris are painless bumps on your skin around your hair follicles.

      Keratosis Pilaris: What It Is, Causes, Symp…

      my.clevelandclinic.org/health/diseases/17758-kerat…
    • 其他用户还问了以下问题
      What does a red patch on a man's sideburn look like?
      A raised, rough-feeling patch on your skin that may be red, pink, skin-colored, or gray. The reddish, pink patch below this man’s sideburn is an actinic keratosis. Flat, scaly area that looks like an age spot. AKs more commonly look like age spots in people who have skin of color.

      Actinic keratosis: Signs and symptoms - American Academy of Dermatol…

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      What are the different types of skin rashes?
      Each general category includes different types of skin rashes with particular causes and symptoms. Common types of skin rashes include dermatitis, psoriasis, hives, insect bites, and shingles. This photo contains medical imagery. Eczema, also known as dermatitis, is a term for different types of swollen skin rashes.

      Skin Rash: Pictures, Types, Causes, Treatment - Health

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      How do you know if a patch of skin is AK?
      A rough-feeling patch on skin that's had lots of sun. You can often feel an AK before you see it. This man said that a small patch of skin on the back of his neck felt like sandpaper. Later, a visible AK appeared on his sandpaper-like patch of skin. One or more rough, scaly bumps that may look like pimples or spots of irritated skin.

      Actinic keratosis: Signs and symptoms - American Academy of Dermatol…

      aad.org
      What does a rash look like?
      Rashes are patches of skin that are abnormal in color or texture. They can look bumpy, scaly, or swollen, and they're usually itchy or painful. Many things can trigger a rash, including allergies, infections, bug bites, or medical conditions.

      Skin Rash: Pictures, Types, Causes, Treatment - Health

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      What causes a red rash on the cheeks?
      For example, pruritus (itchy skin) might be a sign of atopic dermatitis or erythema infectiosum (fifth disease). Erythema infectiosum is a viral infection that can cause a bright red rash on the cheeks, as well as on the torso and limbs. It can also cause a fever.

      Skin Rash: Pictures, Types, Causes, Treatment - Health

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      How do you know if a rash is a herald patch?
      The rash appears in 2 stages. The first stage of the rash is a single, scaly patch called a herald patch. The herald patch is usually oval or round, slightly raised and about 2cm to 5cm across. It usually appears on the chest, thigh, upper arm or neck, but you can get it anywhere on the body.

      Pityriasis rosea - NHS

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    • Verywell Health
      https://www.verywellhealth.com

      20 Types of Skin Lesions: Causes and Pictures - Verywell Health

    • Harvard Health
      https://www.health.harvard.edu › diseases-and...

      Keratosis pilaris: Treatment and self-care for this common skin ...

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