• Skin problems – acne, blisters, peeling skin
• Common objects – contact lenses, ink stains, makeup
• Medical/dental issues – IV catheter, braces, tooth extractions

N’TILAS YODAYIM: In addition to a comprehensive explanation of the halachos of n’tilas yodayim, this section details circumstances that would be problematic or constitute a chatzitzah when ritually washing one’s hands:

• Intervening objects – rings, cuts, bandages, splinters 
• Touching another’s hand after washing
• Performing n’tilas yodayim when there is no cup

WEARING TEFILLIN: This chapter enumerates specific items that could create a barrier for:

• Shel yad – shirt sleeves, bandages, body lotion
• Shel rosh – yarmulkes, toupees, hair gel, dandruff

TOIVELING KAYLIM: Purification of vessels and utensils through mikvah immersion has its own unique concerns:

• Removing labels or stickers
• An air pocket blocking the water
• Immersing more than one item at a time

These are just a few examples of the chatzitzos discussed in this sefer. An addendum after each section details the practical halachos of brochos for that mitzvah.