Lassar's (Zinc Oxide, Salicylic Acid)

Lassar's, containing zinc oxide and salicylic acid, is applied topically to address conditions involving inflammation, keratin buildup, or barrier disruption.

• Minor skin irritations: reduces redness and discomfort by forming a protective barrier.
• Acne: promotes exfoliation of clogged pores and diminishes inflammatory lesions.
• Seborrheic dermatitis: helps control scaling and erythema on affected skin.
• Wart treatment: softens hyperkeratotic tissue to facilitate removal.

• Zinc oxide creates a physical barrier on the skin surface, exerting astringent and anti‑inflammatory effects, while salicylic acid acts as a keratolytic agent that dissolves intercellular connections in the stratum corneum, promoting exfoliation and reducing local inflammation. Together they restore barrier function and normalize epidermal turnover.

Lassar's is generally well tolerated, but local reactions can occur.

Common Side Effects

• Mild skin irritation: transient redness or burning at the application site.
• Dryness or peeling: due to keratolytic activity.
• Pruritus: occasional itching.
• Erythema: mild redness.
• Contact dermatitis: allergic response to ingredients.
• Tingling sensation: brief discomfort.

Serious or Rare Side Effects

• Severe allergic reaction: swelling, hives, or difficulty breathing.
• Stevens‑Johnson syndrome or toxic epidermal necrolysis: extensive skin detachment.
• Systemic salicylate toxicity: unlikely but possible with large area use.
• Ulceration: deep skin breakdown.
• Persistent ulcerative lesions: require medical evaluation.
• Secondary infection: bacterial overgrowth at irritated sites.

Before using Lassar's, consider the following safety measures.

• Avoid use on broken or infected skin: may increase irritation.
• Do not apply to large surface areas: limits systemic absorption.
• Keep away from eyes and mucous membranes: avoid severe irritation.
• Discontinue if persistent irritation or allergic reaction occurs: seek medical advice.
• Pregnancy and breastfeeding safety unknown: consult a healthcare professional before use.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Lassar's may interact with other topical agents; awareness helps prevent adverse outcomes.

Major Interactions (Avoid)

• Concurrent use with other high‑strength keratolytics (e.g., salicylic acid >5%): may cause excessive irritation or chemical burns.
• Application under occlusive dressings: can enhance systemic absorption of salicylic acid.

Moderate Interactions (Monitor Closely)

• Co‑administration with topical corticosteroids: may reduce steroid efficacy.
• Use with photosensitizing agents (e.g., retinoids): may increase sun sensitivity.
• Combination with other astringents (e.g., witch hazel): may cause excessive dryness.
• Simultaneous use with systemic salicylates: monitor for signs of salicylate accumulation.