Pityriasis Lichenoides et Varioliformis Acuta (PLEVA): Symptoms and Treatment

Pityriasis Lichenoides et Varioliformis Acuta, commonly referred to as PLEVA, is an inflammatory skin disorder that causes red, scaly, or crusting bumps to appear on the skin. It belongs to a spectrum of conditions known as pityriasis lichenoides. PLEVA is the 'acute' or sudden-onset version, whereas Pityriasis Lichenoides Chronica (PLC) involves a slower development of less intense symptoms.

In the UK, PLEVA is considered relatively rare. It most frequently affects children, adolescents, and young adults, though it can occur at any age. The name describes the condition's appearance: 'pityriasis' refers to fine scales, 'lichenoides' to the flat-topped appearance of some bumps, and 'varioliformis' because the lesions can resemble the scars left by smallpox (variola).

PLEVA typically begins with the sudden eruption of small, reddish-brown spots or bumps (papules). These often appear on the torso, arms, and legs, though they can spread to other areas. Over a few days, these spots undergo several changes:

• Papules: Firm red or brown bumps that may be itchy or slightly painful.
• Blistering: The centre of the bump may become filled with fluid or look like a blood blister.
• Crusting: The bumps often develop a dark, necrotic (dead skin) crust or a shiny scale in the centre.
• Healing: When the crust falls off, it may leave behind a temporary pale or dark mark (post-inflammatory pigment change) or, in some cases, a small scar.

Individual spots usually heal within a few weeks, but because new crops of spots appear, the condition can persist for months or even years. Patients with PLEVA generally feel well otherwise, though some may experience a mild fever or joint pain during a significant flare-up.

The exact cause of PLEVA remains unknown to medical science. However, the most widely accepted theory among UK dermatologists and NICE (National Institute for Health and Care Excellence) guidance is that it represents a hypersensitivity reaction to an infectious agent. Potential triggers often mentioned include:

• Common viruses like the Epstein-Barr virus (EBV) or Cytomegalovirus (CMV).
• Bacterial infections, such as those caused by Staphylococcus or Streptococcus.
• An abnormal immune response where the body’s T-cells (white blood cells) overreact to a perceived threat.

Crucially, PLEVA is not contagious. You cannot catch it from someone else, nor can you pass it on through physical contact or shared items.

Because PLEVA can mimic other conditions—such as chickenpox, shingles, insect bites, or guttate psoriasis—a professional diagnosis is vital. A GP or dermatologist will typically diagnose PLEVA based on a physical examination of the rash and the patient's medical history.

In some cases, your doctor may recommend a skin biopsy. This involves taking a very small sample of a lesion under local anaesthetic to examine it under a microscope. This helps to confirm the diagnosis and rule out more serious inflammatory conditions or rare forms of skin lymphoma.

While some mild cases of PLEVA resolve on their own without intervention, many British patients require treatment to manage symptoms and speed up clear-up. According to NHS and NICE-aligned practices, common treatments include:

Topical Treatments

Steroid creams or ointments are often prescribed to reduce inflammation and itching. Non-steroidal creams like tacrolimus may also be used for sensitive areas of the skin.

Oral Antibiotics

Certain antibiotics, such as erythromycin or tetracyclines, are used not just to kill bacteria, but for their anti-inflammatory properties. These are often taken for several weeks or months.

Phototherapy (Light Therapy)

If the rash is widespread or persistent, your GP may refer you to a dermatology department for UVB phototherapy. This involves exposing the skin to specific wavelengths of ultraviolet light in a controlled clinical environment.

When you discover a new rash, it can be distressing. Using a service like OnlineDoctor24 allows you to speak to a GP online from your own home. This is particularly useful for PLEVA, as the diagnosis often relies heavily on visual assessment via high-quality photographs or video consultations.

Our clinicians can provide clinical advice, help determine if your symptoms align with PLEVA, and discuss suitable treatment options. If your condition requires more intensive management, such as phototherapy or a biopsy, we can provide a private referral to a dermatologist. For those already diagnosed, we can assist with repeat prescriptions for topical steroids or antibiotics, or provide sick notes if a flare-up is causing significant discomfort or affecting work.

Managing PLEVA involves patience. The condition often has a 'waxing and waning' course, meaning it gets better and worse over time. To support your skin's recovery, you should avoid picking at the crusts, as this increases the risk of secondary bacterial infection and permanent scarring. Using bland emollients (moisturisers) can help soothe dry skin around the lesions. For most people, the condition eventually enters permanent remission, though the timeline varies significantly between individuals.