What causes oozing behind ears

Overview

Oozing behind the ears, medically referred to as discharge or exudate from the postauricular area, is a common symptom that can arise from a variety of underlying causes. While often not serious, persistent or severe oozing warrants medical attention to identify and treat the root cause. The skin behind the ears is a sensitive area, prone to moisture accumulation and irritation, making it susceptible to various conditions.

Common Causes of Oozing Behind Ears

Infections

Skin infections are among the most frequent culprits behind ear oozing.

Impetigo

Impetigo is a highly contagious bacterial skin infection that commonly affects infants and children, but can occur at any age. It typically appears as red sores on the face, especially around a child's nose and mouth, and on hands and feet. These sores rupture, ooze clear or yellowish fluid, and then form a yellowish-brown crust. In some cases, impetigo can develop behind the ears, leading to weeping and crusting in that area. It is usually caused by Staphylococcus aureus or Streptococcus pyogenes bacteria.

Fungal Infections

While less common than bacterial infections, fungal infections can also cause oozing. For example, a severe case of athlete's foot (tinea pedis) could theoretically spread, but more commonly, fungal conditions like tinea capitis (scalp ringworm) can extend to the postauricular area.

Ear Canal Infections (Otomycosis or Otitis Externa)

Infections within the ear canal, such as fungal otitis externa (otomycosis) or bacterial otitis externa (swimmer's ear), can cause discharge. This discharge may leak out of the ear canal and appear as oozing behind the ear. Symptoms include itching, pain, redness, and a feeling of fullness in the ear.

Inflammatory Skin Conditions

Chronic or acute inflammatory conditions of the skin frequently manifest with oozing.

Eczema (Atopic Dermatitis)

Eczema is a chronic inflammatory skin condition characterized by dry, itchy, and inflamed skin. When eczema flares up behind the ears, the skin can become thickened, red, and may weep clear or yellowish fluid, especially if scratched or infected. This weeping is the body's response to inflammation and damage to the skin barrier.

Seborrheic Dermatitis

Seborrheic dermatitis is a common condition that causes flaky, white to yellowish scales on oily areas such as the scalp, face, and chest. It is thought to be related to an overgrowth of a yeast called Malassezia. Behind the ears, it can cause redness, itching, and greasy, yellowish scales. If the skin becomes irritated or scratched, it can lead to inflammation and oozing.

Psoriasis

While typically presenting as well-defined, red patches with silvery scales, psoriasis can sometimes affect the area behind the ears. In this location, it may be more diffuse and can sometimes crack or weep, particularly if irritated or infected.

Allergic and Irritant Reactions

Contact dermatitis, an inflammation of the skin caused by direct contact with a substance, is a common cause of reactions behind the ears.

Allergic Contact Dermatitis

This occurs when the skin comes into contact with an allergen, triggering an immune response. Common culprits include nickel in earrings, fragrances or preservatives in lotions and shampoos, and certain topical medications. The skin becomes red, itchy, swollen, and may develop blisters that can ooze fluid.

Irritant Contact Dermatitis

This is caused by direct damage to the skin from an irritant substance, without an immune response. Harsh soaps, detergents, or excessive friction can irritate the delicate skin behind the ears, leading to redness, dryness, and potential oozing if the skin barrier is compromised.

Other Causes

Cysts and Abscesses

Cysts are closed sacs that can form under the skin, and if they become infected or rupture, they can discharge pus and fluid. Abscesses are localized collections of pus, typically caused by bacterial infection, which can form painful lumps that may drain.

Trauma and Injury

Minor cuts, scrapes, or abrasions behind the ears, if not kept clean, can become infected and lead to oozing. Scratching insect bites in this area can also introduce bacteria and cause a similar reaction.

Cerebrospinal Fluid (CSF) Leak

Although rare, a CSF leak behind the ear can occur after head trauma or surgery. CSF is a clear, watery fluid. If you suspect a CSF leak, seek immediate medical attention as it can lead to serious infections like meningitis.

When to Seek Medical Advice

While occasional mild oozing may resolve on its own, it's important to consult a healthcare professional if you experience:

• Persistent or worsening oozing
• Signs of infection, such as increased redness, swelling, warmth, pain, or fever
• Thick, colored discharge (yellow, green, or bloody)
• Oozing accompanied by a foul odor
• Severe itching or discomfort
• Any suspicion of a CSF leak

A doctor can diagnose the cause of the oozing through a physical examination, patient history, and sometimes diagnostic tests like a skin swab or culture. Treatment will depend on the underlying condition and may include topical or oral antibiotics, antifungals, corticosteroids, emollients, or other specific therapies.