In Jainism, there is no canonical or scriptural rule that makes tilak differences between boys and girls. Tilak (the mark on the forehead) is not a doctrinal requirement of Jain dharma; it is mainly a cultural or regional practice, and its use varies by family, community, and local customs.

Key points:

• The Jain scriptures do not prescribe gender-specific tilak rules.
• Differences in tilak, when seen, are usually due to family traditions or regional customs rather than Jain doctrine.
• If tilak is used, it is often a simple, non-religious-mark tradition during certain ceremonies (e.g., family or cultural events) and should not imply any spiritual distinction between genders in Jain teaching.
• Both Digambar and Shwetambar communities may differ in local styling or materials used, but the core Jain view remains that tilak is not a religious obligation or a measure of spiritual status.

If you have a specific community or ceremony in mind, tell me the place or tradition, and I can explain how that local custom is typically practiced within Jain context.