What Are Lichen Planopilaris Steroid Injection Side Effects?

Steroid injections (such as triamcinolone) into the scalp are used in lichen planopilaris to calm active inflammation and help prevent further scarring, but they cannot regrow hair from follicles that have already been destroyed by scar tissue. While they are a valuable tool, they carry potential local side effects and rare systemic risks. The most common immediate risks include temporary pain or mild bleeding at the injection site ^[1]. Over time, more significant local complications can occur, such as skin thinning, changes in skin color, and the appearance of small, visible blood vessels ^[1][2]. The likelihood of developing these side effects depends heavily on the dose, concentration, spacing of treatments, and clinician technique ^[3][4].

Common Local Risks

When steroids are injected directly into the skin, they can affect the surrounding tissue. The most notable risks include:

• Skin atrophy: This is a thinning or indentation of the skin and underlying fat tissue. In the scalp, atrophy can appear as depressed, pale, or ivory-colored areas ^[1][5][6].
• Hypopigmentation and hyperpigmentation: The skin at the injection site may lose its natural color (hypopigmentation) or, less commonly, become darker (hyperpigmentation) ^[1][2].
• Telangiectasia: You may develop prominent, tiny blood vessels visible near the surface of the skin where the injection was given ^[7][6].
• Pain and bleeding: Temporary discomfort and minor bleeding are common during and immediately after the procedure ^[1].
• Ulceration: An open sore can form on the skin in rare cases ^[1].

Systemic Risks

While whole-body (systemic) effects are uncommon with standard small scalp injections, they become more relevant with larger cumulative doses or repeated treatments over time. Systemic absorption could potentially elevate blood sugar or affect adrenal function ^[8]. Before starting treatment, discuss any history of diabetes, immune suppression, active infections, medication allergies, or conditions that increase bleeding risk with your doctor.

Factors Influencing Risk

The risk of experiencing complications is not the same for everyone. Several variables affect how likely you are to develop side effects:

• Dose and Concentration: Higher concentrations or larger doses of steroids may be considered for stubborn inflammation, but they carry a higher risk of causing side effects like skin atrophy ^[3][9]. Clinicians balance this dose-related risk against the potential benefits, aiming for the lowest effective regimen for your specific situation.
• Treatment Spacing: Injections are often spaced out over several weeks to manage the condition. However, spacing itself does not eliminate risk. Complications like atrophy, pigment change, or telangiectasia may appear well after a treatment and can persist for months or even permanently ^[10][11].
• Clinician Experience: The exact depth and placement of the injection strongly influence outcomes. Because treatment results and the risk of complications depend on the operator’s technique, these injections should only be performed by an experienced medical professional ^[4].

What to Watch For (and When to Act)

Skin thinning or hair loss may also result from the progression of lichen planopilaris itself, so any new change should be assessed by your doctor rather than automatically attributed to the injection.

Seek Urgent or Emergency Care if you experience signs of a severe allergic reaction or serious infection:

• Trouble breathing, or swelling of the face or throat ^[1]
• Fever, rapidly spreading redness or warmth, or pus at the injection site ^[12]

Contact Your Clinician Promptly (do not wait for your next appointment) if you notice:

• A new or enlarging indentation (depression) or a pale patch in your scalp ^[1][6]
• New lightening or darkening of the skin color ^[2]
• Newly visible small blood vessels ^[7]
• Persistent or severe pain that outlasts the initial temporary injection discomfort ^[1]
• Open sores or drainage ^[2]