Xerosis (Dry Skin)

What is it?

Xerosis cutis is a common skin condition characterized by abnormally dry, rough, and scaly skin resulting from insufficient moisture in the outermost layer of the skin (stratum corneum). When the water content of this layer drops below the normal range of 10-30%, the skin loses its suppleness and develops visible scaling, roughness, and sometimes painful fissures (cracks). While usually benign and manageable, xerosis can cause significant discomfort through pruritus (itching) and may predispose to secondary complications such as eczematous dermatitis or skin infections.

Who is affected?

Xerosis is one of the most prevalent dermatological conditions, affecting people of all ages:

• Prevalence: Affects approximately 60% of middle-aged and elderly adults, with prevalence reaching up to 75% in those over 60. In nursing home populations, prevalence may exceed 85%
• Age: Prevalence increases sharply with age due to declining production of natural oils and moisturizing factors. Younger individuals may also be affected, particularly those with atopic predisposition
• Gender: Slightly more common in women, though both sexes are extensively affected
• Risk factors: History of atopic dermatitis, medications that cause dryness (diuretics, statins, retinoids), cold weather and low humidity, frequent hot showers, use of harsh soaps, systemic diseases (diabetes, hypothyroidism, chronic kidney disease)

What causes it?

Xerosis results from disruption of the skin's natural moisture balance through multiple mechanisms:

• Skin barrier dysfunction: The outer skin layer relies on a "bricks and mortar" structure — corneocytes (protein-rich cells) embedded in an intercellular lipid matrix composed of ceramides, cholesterol, and fatty acids. Depletion of these lipids increases water loss and leads to dryness
• Reduced natural moisturizing factors (NMF): Filaggrin, a structural protein in the skin, breaks down into components that attract and retain water. Reduced filaggrin production (from aging, genetic factors, or environmental damage) directly leads to xerosis
• External factors: Cold weather and low humidity, excessive hot water exposure, harsh alkaline soaps (which strip natural oils and raise skin pH), occupational irritant exposure, and dry indoor heating
• Internal factors: Aging (decreased oil production, slower skin renewal), systemic diseases (diabetes, hypothyroidism, chronic kidney disease), medications (diuretics, retinoids, statins), hormonal changes (menopause), and nutritional deficiencies (zinc, essential fatty acids)

What are the clinical features?

Xerosis presents with characteristic changes in the skin's texture and appearance:

Signs:

• Dry, rough, scaly skin (with a grayish or ashy hue, reduced elasticity, and accentuated skin lines)
• Fine flaking and desquamation (shedding of the outer skin layer, particularly on the lower legs, forearms, and hands)
• Fissures (painful cracks in severe cases, especially on the heels, fingertips, and knuckles — may bleed)
• Eczema craquele (advanced xerosis with a characteristic "cracked porcelain" pattern, erythema, and plate-like scaling — also known as asteatotic eczema)

Symptoms:

• Pruritus (itching — the most common and distressing symptom, often worse at night and in winter)
• Tightness and stinging (sensation of the skin being "pulled," particularly after bathing)
• Burning or pain (especially when fissures develop or when irritants contact dry skin)

Common distribution:

• Lower legs (shins — the most frequently affected site, due to fewer sebaceous glands)
• Forearms, hands, and feet
• Lateral trunk
• Areas with fewer oil-producing glands are preferentially affected

How is it diagnosed?

Diagnosis is primarily clinical, based on history and physical examination:

• Clinical assessment: Characteristic dry, rough, scaly skin in typical distribution (lower legs, forearms, hands)
• Severity grading: Mild (scaling confined to skin furrows), moderate (scaling beyond furrows with distinct surface markings), severe (plate-like scaling with fissures — eczema craquele)
• Laboratory tests: Not routine, but may be ordered to identify underlying causes — thyroid function tests, blood glucose, renal function panel, if systemic disease is suspected
• Skin biopsy: Rarely needed — reserved for cases unresponsive to treatment or when ichthyosis vulgaris, psoriasis, or cutaneous T-cell lymphoma must be excluded
• Differential diagnosis: Ichthyosis vulgaris (childhood onset, generalized fine scaling), atopic dermatitis (eczematous patches in flexural areas), psoriasis (well-demarcated plaques with silvery scale), stasis dermatitis (lower legs with edema and varicosities), contact dermatitis

What treatment options are available?

Treatment centers on restoring and maintaining skin hydration:

• Skincare foundation (all severities):

  • Apply moisturizer to damp skin within 3 minutes of bathing ("soak and seal")
  • Moisturize at least twice daily — ointments and creams are more effective than lotions
  • Use lukewarm (not hot) water and limit showers to 5-10 minutes
  • Switch to gentle, fragrance-free, pH-balanced cleansers (syndets) — avoid traditional alkaline soaps

• Evidence-based moisturizer ingredients:

  • Humectants — urea (5-10%), glycerin, lactic acid, hyaluronic acid (attract and bind water)
  • Occlusives — petrolatum, dimethicone, mineral oil (form a barrier that prevents water loss)
  • Barrier repair — ceramides, cholesterol, free fatty acids (replenish the skin's natural lipid structure)

• Prescription options (when moisturizers alone are insufficient):

  • Low-potency topical corticosteroids for inflammatory xerosis with eczematous changes
  • Ammonium lactate 12% for significant scaling
  • Topical calcineurin inhibitors for steroid-sparing anti-inflammatory effect

• Additional measures:

  • Use room humidifiers, especially during winter
  • Wear soft cotton clothing next to skin — avoid wool and synthetic fabrics
  • Pat skin dry after bathing instead of rubbing
  • Wear protective gloves when cleaning or washing dishes
  • Avoid fragranced products (laundry detergents, fabric softeners, perfumed cosmetics)
  • Adequate fluid intake

Key points for patients

• Xerosis is extremely common, affecting more than half of adults over age 60 — it is usually benign and manageable with consistent daily care
• Moisturize immediately after bathing on damp skin and at least twice daily — thicker products (ointments and creams) work better than thin lotions
• Avoid hot showers and harsh soaps — use lukewarm water and gentle, fragrance-free cleansers
• Look for products containing urea, glycerin, ceramides, or petrolatum — these are evidence-based ingredients that restore and protect the skin barrier
• Seek medical attention if dryness does not improve with consistent moisturizing, if skin becomes cracked or bleeding, if there are signs of infection, or if itching severely disrupts sleep
• For many people, xerosis is a chronic condition requiring ongoing management — winter months typically require more intensive care